New international standardized test results show that American 15-year-olds are getting worse at math.

The Program for International Student Assessment, administered to 15-year-olds from 65 developed countries, is releasing data Tuesday that show U.S. teens only score in the middle-of-the-pack among developed nations in reading and science, the New York Timesreports. While those scores stayed the same since 2009, Americans’ math scores dropped; 29 countries performed better in the subject.

Students from Hong Kong, Singapore, Japan, South Korea, and Shanghai were at the top of rankings, but Ireland and Poland pulled ahead of the U.S. this year.